Short recording of some guys singing along the music of a mp3-Player or mobile phone in Portuguese at metro station Trindade (downstairs) in Porto. People were asked what would be the sound they would like to contribute to an installation for the World Music Day at the Subway of Porto (organized by Casa da Música).Recorded with Roland Edirol R-09 digital recorder and Edirol CS-15 cardioid-type stereo microphone.